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Fundamental investigations on the ionic transport and thermodynamic properties of non-aqueous potassium-ion electrolytes

Author

Listed:
  • Shobhan Dhir

    (University of Oxford)

  • Ben Jagger

    (University of Oxford)

  • Alen Maguire

    (University of Oxford)

  • Mauro Pasta

    (University of Oxford)

Abstract

Non-aqueous potassium-ion batteries (KIBs) represent a promising complementary technology to lithium-ion batteries due to the availability and low cost of potassium. Moreover, the lower charge density of K+ compared to Li+ favours the ion-transport properties in liquid electrolyte solutions, thus, making KIBs potentially capable of improved rate capability and low-temperature performance. However, a comprehensive study of the ionic transport and thermodynamic properties of non-aqueous K-ion electrolyte solutions is not available. Here we report the full characterisation of the ionic transport and thermodynamic properties of a model non-aqueous K-ion electrolyte solution system comprising potassium bis(fluorosulfonyl)imide (KFSI) salt and 1,2-dimethoxyethane (DME) solvent and compare it with its Li-ion equivalent (i.e., LiFSI:DME), over the concentration range 0.25–2 molal. Using tailored K metal electrodes, we demonstrate that KFSI:DME electrolyte solutions show higher salt diffusion coefficients and cation transference numbers than LiFSI:DME solutions. Finally, via Doyle-Fuller-Newman (DFN) simulations, we investigate the K-ion and Li-ion storage properties for K∣∣graphite and Li∣∣graphite cells.

Suggested Citation

  • Shobhan Dhir & Ben Jagger & Alen Maguire & Mauro Pasta, 2023. "Fundamental investigations on the ionic transport and thermodynamic properties of non-aqueous potassium-ion electrolytes," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39523-0
    DOI: 10.1038/s41467-023-39523-0
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    References listed on IDEAS

    as
    1. Jack Fawdon & Johannes Ihli & Fabio La Mantia & Mauro Pasta, 2021. "Characterising lithium-ion electrolytes via operando Raman microspectroscopy," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    2. James T. Frith & Matthew J. Lacey & Ulderico Ulissi, 2023. "A non-academic perspective on the future of lithium-based batteries," Nature Communications, Nature, vol. 14(1), pages 1-17, December.
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